His big brother Rayce, six, assured his mom Nicole Powell, 29, he'd always look out for his precious brother - and asked to give him a cuddle one morning.
And the mom-of-five was left smiling when the schoolboy started singing "their song" — "10,000 Hours" by Dan + Shay & Justin Bieber.
Nicole Powell / SWNS
She captured the touching moment on her phone, to send to husband JJ, 39.
Police officer Nicole also posted it on her Facebook - where the clip amazingly racked up more than 8 MILLION views.
Nicole, from Cabot, Arkansas, said:
"It's amazing. I had wondered our purpose - of why now do we have a baby with Down syndrome. I think maybe it was to bring love and awareness. People are so terrified of what can happen. But he's perfect. It's super scary, but parenthood is scary in general. I'm so proud of my sons."
Nicole and husband JJ, who owns a car sales business, found out Tripp would likely have the condition during scans before he was born.
Nicole Powell / SWNS
She admits they were "not educated" about Downs syndrome and said doctors warned he could have major heart problems.
"Honestly I was really terrified because I wasn't educated at all about Down syndrome, and I hadn't been around anyone with Down syndrome," she said, adding:
"I had this horrible picture in my head and I was thinking the absolute worst. My biggest fear was I was afraid of the future. I was uneducated and didn't understand. I thought 'I have four other children, they all love each other, I just want them to love him the same way they love each other.'"
"We explained to them early. I didn't know much but I told them what I did know. We told them it just means he will be different but he's still your brother. The boys answered and told us 'but we're all different.' And we were like 'ok, this is going to be fine.'"
Nicole Powell / SWNS
She said later scans revealed his heart was healthy, and when she finally saw him when he was born via c-section on November 21 he was "absolutely perfect."
After a month in the hospital he came home to the family - including Jayce, nine, Rayce, six, Grayce, two, and Reese, one, on Christmas Eve.
On the way home in the car the love song "10,000 Hours" came on the radio, and Rayce started singing it to his little brother.
Nicole Powell / SWNS
"Both the boys love music," said Nicole.
"Rayce was saying 'this song is about me and you' - he doesn't know it's about a husband and wife. He decided it was 'their song.'"
She woke up on December 30 and took Tripp in to see Rayce and Jayce, and the eldest was listening to the song on YouTube, and asked to hold his brother.
Nicole Powell / SWNS
He cradled him and stared into Tripp's eyes while he sang the song:
"I'd spend ten thousand hours and ten thousand more. Oh, if that's what it takes to learn that sweet heart of yours. And I might never get there, but I'm gonna try. If it's ten thousand hours or the rest of my life.I'm gonna love you."
Nicole Powell / SWNS
She posted the video online before she went to bed, and was surprised when it received 90 likes before she fell asleep.
But she woke up to see it had been viewed a million times overnight, and a week later it has more than 8,000,000 views.
You can check out Dan + Shay and Justin Bieber's official "10,000 Hours" music video below:
